Additives for animal nutrition and technique for their preparation

Abstract: This invention pertains to a composition of additives for animal feed which includes a solution of volatile and/or irritating products in a liquid coagulating agent which is absorbed on a vegetable and/or mineral carrier in particles. This carrier is, at least partially, coated with coagulated protein particles bound to this same carrier in order to diminish the free contact area of the carrier. The additive composition can be advantageously blended with premixes or with animal feed.

Description: This invention refers to additives for animal nutrition and process for preparation, as well as for animal feed containing these additives. For various reasons (improvement of digestibility, taste, etc.), animal feed often contain additives with a volatile compound base, such as alcohols, aldehydes, cetones and aliphatic or aromatic esters, etc., and/or stingy and "hot" flavours contained for example in capsicum, peppers, mustards, horseradish, ginger, etc. Due to their volatile nature, however, these compounds evaporate easily when the packaging is opened or when the additives are mixed with other feed. For example, a loss of approx. 20 % is noticed when proceeding to a dilution of 1 % in a mineral feed premix. On the other hand, these compounds often smell very strongly and are aggressive to human skin, and then present an important inconvenience to employees manipulating these additives when preparing animal feed. It is also known from FR-A-1 516 055 to protect aroma in food products from degradation for example due to oxidation with an external fatty coating. Protection coating for liquid powder is also known from US-A-4 921 705. The purpose of this invention is thus to provide a composition of additives for animal nutrition which comprises volatile and/or irritating products absorbed on a vegetable and/or mineral carrier, which is not aggressive to human skin. This composition is characterized in that the volatile and/or irritating products are absorbed as a solution thereof together with a coagulating agent, said coagulating agent being a subsituted phenol, on a carrier which is in particles and which is at least partially coated with coagulated protein particles bound to this carrier so as to diminish its free contact area. As second objective of this invention is the process for the preparation of this composition of feed additives, characterized by the following: The volatile and/or aggressive products are dissolved in a first coagulating agent composed of at least one substituted phenol, The solution obtained is absorbed on particles of a mineral and/or vegetable carrier, A coagulable protein is blended by mixing with the mass obtained, Water is then sprayed onto this mass in the presence of a second coagulating agent. The third objective of this invention is the animal feed containing the above mentioned feed additives. All types of volatile products and/or hot and irritating flavours can be used in this invention as far as they are authorized for animal feed. As an example of volatile compounds, we can mention alcohols such as creosol, guaïacol, thymol, eugenol, etc., aldehydes such as salicylaldehyde, benzaldehyde, cinnamaldehyde, etc., cetones such as decalactone, undecalactone, etc., aliphatic or aromatic esters such as methyl-, ethyl-, butyl-, amyl-, etc. as acetates, butyrates, caproates, benzoates, cinnamates, salicylates, etc. The "hot" and stingy compounds can be found in capsicum, peppers, mustards, horseradish, ginger, etc., such as capsaicin, piperin, gingerol, shogaol, allyl isothiocyanate, etc. As absorbing carrier usable in this invention, we can mention vegetable carriers such as carboxymethylcellulose, sawdust, etc. and/or mineral carriers such as vermiculite, expanded silica, kaolin, etc. These carriers are generally particles - spherical shaped or not - measuring approximately 0,1 to 1,5 mm. The protective "coating" bound to the carrier aims at diminishing the evaporation contact area, while at the same time diminishing the evaporation of the volatile and/or aggressive products, is made of an agglomerate of microparticles or microspheres (diametre approx. 50 to 200 µm) of coagulated proteins, for example casein, milk powder, lactalbumin, egg albumin, blood protein, a vegetable protein such as soybean protein, etc. The technique for preparing the additives according to this invention preferably comprises the following steps: A substituted phenol used as first coagulating agent (internal coagulant) chosen for example among the cresols, guaïacol, benzenediols, thymol, creosol, eugenol, etc., is added to the volatile and/or aggressive products. The substituted phenols amount to approx. 50 to 90 % of the solution, preferably as cresols and/or resorcin; This solution is absorbed on particles or powder of a mineral and/or vegetable carrier; A coagulable protein is blended with the mass obtained, then, Either add a tannin powder (tannic acid) and/or an oak bark powder, as second coagulating agent ("external" coagulant). The mass is then sprayed with water; Or spray an aqueous solution of a second inorganic coagulant agent such as a double aluminium potassium sulfate (alun); and finally store during 48 to 72 hours and rehomogenize the final product. As mentioned above, the second coagulating agent or external coagulant can be added directly to the mass before spraying (tannin powder or oak bark powder) or simultaneously (aqueous alun solution). The various steps of the technique are generally carried out in an ordinary feed mixer or in a screw mixer, preferably with slow rotating speed. All the steps of the technique referring to this invention can be carried out at room temperature, generally between 15° and 30° C. If the temperature falls below 15° C, the time needed to carry out these steps should be extended (by 10 to 20% below 10° C); and storage period prolonged by 24 to 48 hours, if temperature falls below 15° C. The final product (additive) will then show the following ratio of the various constituents (weight %): Vegetable carrier 10 - 40 Mineral carrier 0 - 20 Solution of volatile and/or aggressive products 20 - 30 Coagulated proteins 10 - 30 Coagulating agent 2 - 5 Water 5 - 15 The additives, according to the invention, can then be blended with the vitaminized feed premixes and/or with concentrated animal feed. The invention is now illustrated according to the following examples. Example 1 Add 5 to 50 g. of cresols and 1 to 20 g. resorcin to a 200 g. solution of volatile products, as for example, the following aromatic mixture. Aromatic mixture: Thymol 25 - 35% Guaïacol 10 - 15% Eugenol 5 - 10% Vanilline 10 - 20% Salicyhaldehyde 5 - 10% Limonene (solvent) 20 - 35% This solution is absorbed in a 450 g. mixture of sawdust (90%) and expanded silica (10%) by mixing in a feed or screw mixer for 2 to 15 min. The product obtained is then added to 200 g. of skim milk powder or casein by mixing for 2 to 15 min. The quantity of the added product can vary between 100 and 250 g. according to the conditions and the nature of the coagulable protein. 50 g. of powdered tannin is then blended with the mass and mixed during 2 to 15 minutes. The amount of tannin can vary between 20 and 100 g. according to the quality of the tannin and the quantity of coagulable proteins. The tannin can also be replaced by an inorganic coagulant, for example, aluminium potassium sulfate (alun) dissolved in water and added during the following step of the technique. Finally, 50 g. of water, eventually containing an inorganic coagulant, are sprayed onto the mass during the final phase of the mixture which will last approximately another 5 to 20 minutes. The product should then preferably be packed in waterproof bags and stored during 48 to 72 hours; it is recommended to rehomogenize by simply mixing the product, after the preliminary storage period. Example 2 25 g. of capsaicin and 25 g. of piperin (irritating products), or only 50 g. of capsaicin are dissolved into 125 g. of m-cresol (or 100 to 200 g.). The solution obtained is absorbed in 250 g. (200 - 400 g.) of sawdust or carboxymethylcellulose in a feed or screw mixer for 2 to 15 min. The following products are then added to the mixture in the order mentioned below and each product is blended for 2 to 15 min. 25 g. of a resorcin solution in m-cresol (1:4) (or 10 to 50 g. resorcin); 100 g. of milk powder (100 - 300 g.) or casein; Eventually 25 g. of tannin (10 - 50 g.); and eventually 250 g. sawdust (or carboxymethylcellulose) (up to 500 g.). Finally, 75 g. of water (50 - 150 g.) are sprayed onto the mass obtained. To this amount of water 5 to 10 g. of alun are added, if tannin was not added in the previous step. The product is again mixed for 5 to 15 minutes after spraying and is then preferably packaged in waterproof bags and stored at room temperature during 48 to 72 hours. After this intermediary storage period, the product is rehomogenised in the mixer (5 to 15 minutes). It can also be blended with a mixture of volatile products (example 1) in a proportion of 5 to 20 %. Example 3 The additives obtained, as described in examples 1 and 2, can be diluted by blending with concentrated feed preparations or "premix"; as an example, see the following composition: Additive according to the invention 0,3 - 3 % Vitamin mixture (A,B,D,E, nicotinic acid, etc.) 0,1 - 1 % Mineral salts (CaHPO 4 , CaCO 3 , NaCl, CuO, MnO, FeSO 4 , ZnO, etc.) 25 - 75 % Cereal by-products (bran, middlings, etc.) 21 - 75 % Still, and only as an example, the premix mentioned above can in a final stage, be blended with the following preparation to produce animal feed: Premix 0,3 - 3,5 % Cereals and peas approx. 50 % Oil cake (soya bean, rapeseed, etc.) approx. 25 % Cereal by-products 21 - 25 % According to the invention, the feed additives have the advantage that they do not allow rapid evaporation of the volatile products that they contain, this is due to the partial "coating" of the absorbant carriers by an agglomerate of microparticles of coagulated proteins. For example, in the case of a premix containing 1 % of the additive according to the invention, with a base of volatile products, the evaporation loss is lower than 10 %, whereas in a known preparation containing the same volatile products, the evaporation loss is in the range of 20 %. On the other hand, we notice another advantage with the additives according to the invention, and that is when using strong smelling products or products aggressive to human skin. With the additives, these reactions are considerably diminished. For example, when a classical absorbant containing 5 % capsaicin is in contact with human skin for a few minutes, it will after one hour, provoque a red blemish on the skin, 2 to 3 times larger than the contact size. On the other hand, the additive according to the invention (also containing 5 % capsaicin) under the same conditions, will provoque a slight pinkish spot the same size, if not smaller, than the contact size.

Claims: Composition of additives for animal nutrition which comprises volatile and/or irritating products absorbed on a vegetable and/or mineral carrier, characterized in that the volatile and/or irritating products are absorbed as a solution thereof together with a coagulating agent, said coagulating agent being a subsituted phenol, on a carrier which is in particles and which is at least partially coated with coagulated protein particles bound to this carrier so as to diminish its free contact area. Composition according to claim 1, in which the substituted phenol is chosen among cresols, guaïacol, benzenediols, thymol, creosol, and eugenol. Composition according to claim 1 or claim 2, in which the coagulated protein particles are approximately spherical, with a diameter of about 50 to 200 µm, and bound to the surface of the carrier as an agglomerate. Composition according to one of claims 1 to 3, in which the vegetable carrier is chosen among carboxymethylcellulose and sawdust, and the mineral carrier is chosen among expanded silica, vermiculite and kaolin. Composition according to one of claims 1 to 4, in which the particle size of the carrier is between 0,1 and 1,5 mm. Composition according to one of claims 1 to 5, in which the protein is chosen among animal proteins, such as milk powder, casein, lactalbumin, egg albumin and blood meal, and vegetable proteins, such as soybean protein. Composition according to one of the claims 1 to 6 containing by weight 10 to 40% vegetable carrier, 0 to 20% mineral carrier, 20 to 30% volatile and/or irritating products, 10 to 30% coagulated proteins, 2 to 5% coagulating agent and 5 to 15% water. Process for the preparation of a composition of additives according to one fo claim 1 to 7, characterized by the fact that the volatile and/or irritating products are dissolved in a first coagulating agent constituted by a substituted phenol, the solution obtained is absorbed on particles of a mineral and/or vegetable carrier, a coagulable protein is blended with the mass obtained by mixing and, water is sprayed onto this mass in the presence of a second coagulating agent. Process according to claim 8, characterized by the fact that the substituted phenol is chosen among cresols, guaïacol, benzenediols, thymol, creosol and eugenol. Process according to claim 8 or claim 9, characterized by the fact that the second coagulating agent is blended with the mass before spraying with water or added to the water used for spraying. Process according to claim 10, characterized by the fact that the second coagulating agent is a tannin or oak bark when added to the mass, and is a double aluminium potassium sulfate when added to the water used for spraying. Process according to one of claims 8 to 11, characterized by the fact that the composition obtained is stored in waterproof packaging for at least two days, and is then, if necessary, rehomogenized by mixing before use. Premix for the preparation of animal feed, which contains a composition of additives according to one of claims 1 to 7. Animal feed containing a composition of additives according to one of claims 1 to 7, or a premix according to claim 13.

Inventors: ROSSI JEAN, ROSSI, JEAN
Applicants: CRINA, CRINA S.A.
Application year: 1994
Main classification: A23K1
IPC codes: A23K1, A23L1